Congrats Sasquatch16!
My suggestion on your first century is to try and learn from that experience. To me, the first one was also really difficult. It was actually a 200K brevet so was actually 128 miles. Two years later a century is really not something I dread. Sometimes they are difficult but that is usually when riding with a group where I really push the pace.
I'm sure you realize that losing additional weight will help, especially with a lot of climbing. To date, two of my easiest centuries I have done had a mile of climbing. Where I live it is very flat, hot, humid and windy almost 12 months a year. So riding a century with hills, temps below 90 degrees and low humidity is a blessing for me.
Keep riding and you will figure it out. Good luck on your next one
